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subhobhai943andClaude Opus 4.8
0377726615
Add three real platform device drivers (x86 hardware, ARM-stubbed): - drivers/timer/hpet.c + include/drivers/hpet.h: High Precision Event Timer. Maps the HPET block at the standard 0xFED00000, reads the femtosecond period from the capability register, enables the main counter and exposes a monotonic nanosecond time source (hpet_get_ns) far finer than the 100 Hz PIT. - drivers/char/lpt.c + include/drivers/lpt.h: IBM PC parallel port (LPT1) with the Centronics data/strobe handshake over ports 0x378/0x379/0x37A. - drivers/char/nvram.c + include/drivers/nvram.h: MC146818 CMOS NVRAM read/write over 0x70/0x71, preserving the NMI-disable bit, with checksum and hex dump. Wired all three into the [5/14] device-enumeration boot step and added LazyBox applets `hpet`, `lpt`, and `nvram`. Verified live under QEMU (screenshotted): HPET reports 100 MHz / 3 comparators / 10 ns period and its counter advances ~1.4 s of real time between two `hpet` runs; NVRAM dumps 128 bytes with a computed checksum; LPT1 detected at 0x378. Clean build on x86_64/aarch64/armv8i; 0 panics / 0 OOM. Co-Authored-By: Claude Opus 4.8 <[email protected]> Claude-Session: https://claude.ai/code/session_01Fh5z6V7nGPbHvqVG5p4CXX
22 lines
762 B
C
22 lines
762 B
C
#ifndef _DRIVERS_HPET_H
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#define _DRIVERS_HPET_H
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// High Precision Event Timer (HPET) driver.
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//
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// The HPET is a memory-mapped, free-running up-counter defined by the
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// Intel/Microsoft HPET spec and emulated by QEMU at the standard base
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// 0xFED00000. It provides a monotonic high-resolution time source far finer
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// than the 100 Hz PIT tick.
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#include <stdint.h>
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#include <stdbool.h>
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void hpet_init(void);
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bool hpet_available(void);
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uint64_t hpet_read_counter(void); // raw main counter value
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uint64_t hpet_get_frequency_hz(void); // counter ticks per second
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uint64_t hpet_get_ns(void); // nanoseconds since HPET was enabled
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uint32_t hpet_num_timers(void); // comparator count reported by the block
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#endif // _DRIVERS_HPET_H
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